# Siemens PAC

#### 1. Accessing the Menu

To change the settings, navigate using the meter's display:

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* Press the bottom button (F4) to open the main menu.
* Navigate to Settings.

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#### 2. Network & Communication (Modbus TCP)

A stable network connection is crucial. It is highly recommended to use a static IP address.

In the *Settings* menu, go to Communication.

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* Select Modbus TCP.

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* Choose Network Settings.
* IP Configuration:
  * Disable DHCP: Turn off DHCP to prevent the IP address from changing after a reboot (which would break the connection).
  * IP Address: Enter a unique, free IP address.
  * Subnet: Enter the correct subnet mask.
  * Gateway: Enter the correct gateway.

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#### 3. Setting Current Transformers (CT)

Configuring the correct CT ratio (Transformation ratio) is essential for accurate measurements and correct control.

* Return to the Settings menu.
* Select Basic Parameters.

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* Choose Current Inputs.

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* Configure Values:

  * Set the CT Primary and CT Secondary values.
  * These values must match the specifications found on the physical current transformers (e.g., 250A primary / 5A secondary).

  <mark style="color:$warning;">Warning: Incorrect values will lead to wrong measurements, causing the energy management system to malfunction.</mark>

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#### 4. Completion

Once the network data is saved and the CT ratios have been verified, the Siemens PAC 2200 is ready to be integrated into the EMS system.
